Robert edward stewart



(No Model.)

R. E. STEWART.

SWITGH'STAND FOR DYNAMO STATIONS. No. 400,139.

Patented Mar. 26, 1889.

ATTORNEYS.

UNITED STATES PATENT OEEicE.

ROBERT EDNVARD STEVART, OF DALLAS, TEXAS, ASSIGNOR TO HIMSELF AND JOHN HUGH SPIVEY, OF SiiillE PLACE.

SWITCH-STAND FOR DYNAlVlO-STATIOEJS.

SPECIFICATION forming part of Letters Fatent No. 400,139, dated ll Larch 26, 1889.

Application filed December 28, 1888. Serial No. 294,855. (No model.)

To all whom it may concern:

Be it known that I, ROBERT EDWARD STEw- ART, of Dallas, in the county of Dallas and State of Texas, have invented a new and Improved Switch-Stand for Dynamo-Stations, of

which the following is a specification, reference being had to the annexed drawings, forming a part thereof, in which Figure 1 is a front elevation of my im- IO proved switch-stand for dynamostations,and

Fig. 2 is an end elevation.

Similar letters of reference indicate corresponding parts in both views.

The object of my invention is to provide a I 5 simple and efficient switch for introducing dynamos into an electric circuit and removing them therefrom, as occasion may require.

My invention consists in the combination, with outside circuit-wires, of switch-contacts arranged in pairs, there being as many pairs of such contacts as there are dynamos belonging to the circuit.

It also consists in the combination, with the pairs of contacts, of corresponding pairs of swinging arms, the arms of each pair being insulated from each other and adapted to engage the contacts of the outside circuit.

It also further consists in the combination, with the contacts and the swinging arms, of a hinged plate connected with each pair of swinging arms, all as will be hereinafter more fully described.

The frame A, forming the support of the switch, consists of the side bars, a a, the end bars, Z) I), and the longitudinal bars 0 c, attached to the face of the end bars, I) I). To the frame A (in the present case) are secured four switches, B B B B"; but I do not limit or confine myself to any particular number, and as the four switches are precisely alike a description of the details of one will be suffieient.

To the bar 0 are attached spring-contacts (I, each being provided with two spring-arms, e. 3 To the inner face of the bar a are attached two angled plates, f, which are oppositely arranged with reference to each other, and which are connected with the binding-posts g g, placed upon the outer side of the bar a. To the plates f are pivoted the arms 71, the said arms being connected with each other by wooden bars if, placed between them and fastened to the arms by screws or bolts. The arms 7L are arranged exactly opposite the spaces between the spring-arms e, and are provided with ears 7;, which may be forced between the arms 6, forming a frictional contact.

To the inner surface of the bar cis pivoted a right-angled plate, 7, which is capable of being turned over the top of the said bar (2 and forming an electrical connection with the contaets d. The plate 7, near the center of its free edge, is provided with ears m, between which is pivoted one end of a connecting-rod, n, the opposite end of which is pivotallyconnected with the wooden bar j. To the lower end of the bar 0 is attached a binding-post, 0, and in like manner to the lower end of the bar 0 is attached a binding-post, o. A wire, p, connects the binding-post 0 with the first contact d of the switch B. The second contact (Z of the said switch is connected by a wire, q, with the first contact (Z of the switch 13, the second contact of the said switch being connected by the wire '1- with the switch 13 and the said switch B is connected in turn with the switch 13" by the wire .9. The switch i3 is connected with the binding-post o by the wire t. A dynamo is connected with each pair of binding-posts g g. The binding posts 0 0 are connected with the outside circuitwires. \Yhen the arms 71 h are thrown into engagement with the spring-arms c, the current from the dynamo passes through the arms 7t into the circuit through the contacts (I. \Yhen it is desired to throw the dynamo out of the circuit, the arms h are withdrawn from between. the spring-arms c. This operation breaks the circuit of the dynamo and carries the angled plate Z over so that it touches both of the contacts (I, as shown in the switch 3 the circuit being completed through the said angled plate Z.

My improved switch is designed more particularly for introducing a reserved dynamo into the circuit when one of the dynamos in use becomes disabled. In such case the reserved dynamo would be connected with an open switch, and when the dynamo is to be introduced onto the circuit the arms 71 are swung over into engagement with the springarms 6, and at the same time the hinged angled plate Z is removed from the contacts d, thereby causing the current to flow from the dynamo through the said arms h into the circuit. At the same moment the switch of the disabled dynamo is removed from the circuitby an operation which is the reverse of that just described.

By the use of my improved switch all danger of shocks to the attendant is avoided, as the operation of introducing a dynamo into the circuit or removing it therefrom is performed by the movement of a single switch, the switch being provided with a non-conducting handle of sufficient length to prevent the possibility of the flowing of the current to the person of the operator.

Having thus described my invention, I claim as new and desire to secure by Letters Patent 1. In a switch-stand, the combination, with a pair of electrical contacts and a pair of swinging arms insulated from each other and adapted to be moved together to engage the contacts, of a movable plate connected with the swinging arms and fitted to touch both electrical contacts, substantially as specified. 1'

2. In a switch-stand, the combination of in terrupted outside circuit-conductors provided with spring-contacts on opposite sides of the breaks of the circuit, one or more pairs of arms, each pair being connected with the terminals of a dynamo, and plates arranged to close the circuit between the contacts, substantially as specified.

3. In a switch-stand, the combination of the frame A, contacts (Z, attached to the frame, arms 71, adapted to engage the contacts, the plates 7, and the rods 11, substantially as specified.

4. In a switch-stand, the combination of the frame A, the spring-contacts d, attached to the frame, the angle-plates f, the arms 71, provided with ears k, the insulating-bars i j, connecting the said arms 71, the hinged angled plates Z, the connecting-rods n, and the circuit-connections, substantially as specified.

ROBERT EDXVARD S' ElvART.

\Vitn esses:

D. P. MAHoNY, HUGH MURRAY. 

